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Sensing and Control
Honeywell Inc.
11 West Spring Street
Freeport, Illinois 61032
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Airflow Sensors
Microbridge Mass Airflow/Unamplified
AWM1000 Series
Figure 1
Heater Control Circuit
FEATURES
1 Cost-effective microbridge technology
1 Accurate, repeatable airflow sensing
1 Bi-directional sensing capability
1 Low differential pressure sensing
Take advantage of microbridge mass
flow sensor technology. The AWM1000
series mass flow sensor provides all of the
outstanding performance benefits of the
standard AWM2000 series in a more costeffective sensor platform. This device provides accurate, repeatable flow sensing.
Sensor to sensor interchangeability
specifications are approximately twice as
large as compared to the AWM2000 series.
Figure 3
Differential Instrumentation Amplifier Circuit
Airflow
The heater control circuit in Figure 1 and
the sensing bridge supply circuit in Figure
2 are both required for operation per
specification. These two circuits are NOT
on board the sensor and must be supplied in the application. The differential
amplifier circuitry in Figure 3 may be useful in providing output gain and/or introducing voltage offsets to the sensor output (Ref. Equation 1).
Figure 2
Sensing Bridge Supply Circuit
NOTE: For applications involving sensing hydrogen (H2) gas or helium (He) gas,
see Application Note 3, page 131.
Equation 1:
VoJ
( )( )( )
2R2+R1
R1
where V offsetJVS
R4
R3
V2-V1
+V offset
( )
R6
R6+R5
Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada
65
Airflow Sensors
Microbridge Mass Airflow/Unamplified
AWM1000 Series
AWM1000 SERIES ORDER GUIDE (Performance Characteristics @ 10.0 ±0.01 VDC, 25°C)
Catalog Listings
AWM1100V
Flow Range (Full Scale)
±200 sccm
Pressure Range
(See Application Note #1)
AWM1200V
AWM1300V
+1000 sccm to −600 sccm
±4.0N H2O (10 mBar)
Output Voltage @ Trim Point
30 mV @ 100 sccm
20 mV @ 2.0N H2O
50 mV @ 650 sccm
Null Voltage Shift, Typ.
+25 to −25°C, +25 to 85°C
±0.7 mV (max.)
±0.7 mV (max.)
±0.7 mV (max.)
Output Voltage Shift, Max.
+25 to −25°C
+25 to +85°C
±4% Full Scale
±4% Full Scale
+22% Reading (Note 2)
−22% Reading
±4% Full Scale
±4% Full Scale
Repeatability & Hysteresis, Max.
±1% Full Scale
±1% Full Scale
±1% Full Scale
Min.
Typ.
Max.
Excitation (VDC) (Note 1)
8.0
10±0.01
15
Power Consumption (mW)
—
30
50
Null Voltage (mV)
−1.0
0.0
+1.0
Response Time (msec)
—
1.0
3.0
Common Mode Pressure (psi)
—
—
25
Sensor Resistance (kΩ)
Pin 2-Pin 1, Pin 6-Pin 1
—
5
—
Sensor Current (mA)
Pin 2-Pin 1, Pin 6-Pin 1
—
0.3
0.6
Temperature Range
Operating: −25° to +85°C (−13° to +185°F); Storage: −40° to +90°C (−40° to +194°F)
Termination
2,54 mm (.100N) centers, 0,635 mm (0.025N) square
Weight (grams)
10.8
Shock Rating
100 g peak (5 drops, 6 axes)
Notes:
1. Output Voltage is ratiometric to supply voltage.
2. Temperature shifts when sensing differential pressure correlates to the density change of the gas over temperature.
See Application Note 1.
3. Maximum allowable rate of flow change to prevent damage: 5 SLPM/1.0 sec.
MOUNTING DIMENSIONS (for reference only)
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Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada
Airflow Sensors
Microbridge Mass Airflow/Unamplified
OUTPUT FLOW VS INTERCHANGEABILITY (Note 1)
AWM1100V
Performance Characteristics @ 10.0 ±0.01 VDC, 25°C
AWM1200V
Press
mBar
Flow
sccm
0.49
200
0.35
150
0.21
0.09
0
AWM1000 Series
Nom.
mV
(Note 2)
AWM1300V
Tol.
±mV
Flow
sccm
Press.
N H2O
Nom.
mV
Tol.
±mV
Press
mBar
Flow
sccm
44.25
4.25
120
4.00
31.75
8.0
3.4
1000
55.50
7.0
38.75
3.00
90
3.00
26.75
6.0
2.4
800
52.90
6.0
100
30.00
1.00
60
2.00
20.00
3.0
1.8
650
50.00
5.0
50
18.40
2.00
30
1.00
11.20
4.0
0.83
400
42.50
6.0
200
29.20
5.0
0
0.00
1.5
0
Nom.
mV
Tol.
±mV
0.00
1.00
0
0.00
0.00
1.0
0.31
−0.09
−50
−18.40
3.90
−30
−1.00
−11.20
7.0
0
−0.21
−100
−30.00
5.00
−60
−2.00
−20.00
7.0
−0.31
−200
−28.90
15.0
−0.35
−150
−38.75
7.65
−90
−3.00
−26.75
11.0
−0.83
−400
−41.20
26.0
−0.49
−200
−44.25
9.75
−120
−4.00
−31.75
15.0
−1.6
−600
−48.20
30.0
Notes:
1. Numbers in BOLD type indicate calibration type, mass flow or differential pressure. Tolerance values apply to calibration type only.
2. Differential pressure calibrated devices are not recommended for flow
measurement. Use flow calibrated devices for flow measurement.
OUTPUT CURVES
Airflow
Honeywell 1 Sensing and Control 1 1-800-537-6945 USA 1 F1-815-235-6847 International 1 1-800-737-3360 Canada
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